Materials Literature
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Abstract Fünf verschiedene Messverfahren wurden zur Partikelgrößenanalyse von nanodispersen ZrO2‐Pulver verglichen. Mit der Laserstreulichtanalyse, der dynamischen Lichtstreuung (heterodyne DLS und homodyne DLS‐PCS), der Sedimentationsanalyse im Zentrifugalfeld und der Ultraschallspektrometrie wurden wässrige ZrO2‐Sus…
The basic properties of the consolidated titanium powder materials obtained by two methods of electrical pulse sintering and conventional vacuum sintering were investigated. Titanium powder consists of spherical and nonspherical forms and has the distribution of the particle size 200–400 microns. The powdered composit…
Kinetic arrest (KA) has been observed in the Mn50Ni36Sn9Co5 ferromagnetic shape memory alloy. Magnetic measurements show that the magnetostructural transformation in Mn50Ni36Sn9Co5 is kinetically arrested below 35 K when the cooling field exceeds 10 kOe. Calculation of the fraction of frozen austenite at 10 K indicate…
The electronic structure and optical properties of the LiIn1–xGaxSe2 (x = 0, 0.25, 0.5, 0.75, 1) solid solution were studied by density functional theory (DFT) with pure functionals. The exchange-correlation is treated within the local density approximation (LDA) and generalized-gradient approximation (GGA). The elect…
Abstract: Powering implantable devices in human body with a glucose based fuel cell (GFC) offers an alternative to non-rechargeable batteries that typically require routine invasive surgery. There are three main approaches for GFCs to oxidise glucose. Enzymatic Fuel Cells are selective and have a high reaction rate bu…
Thermoelectric (TE) materials are increasingly promising for power generation in medium to high-temperature environments. Recent research on thermoelectric generators (TEGs) has determined the thermodynamic properties which impact the total efficiency and figure of merit (ZT) of these materials. A large Seebeck coeffi…
In this work, the effect of hard tribological coatings was studied in terms of mitigating impact damage between tungsten carbide spherical elements and two different types of steel substrates. The coatings included a hard, highly elastic Tungsten-incorporated diamond-like carbon (W-DLC) coating at two different thickn…
Paddle-type and double-sided nanostructures have much potential for measuring the angular speed in rotary systems and aerospace applications. While most investigations in the literature have concentrated on the electromechanical performance of conventional beam-type nanostructures, few researchers have addressed the p…
A point electron source is desired to improve performance of high brightness electron beam instruments. It is valuable to create nano-sized tungsten (W) tip from sharp ordinary polycrystalline W needle. The sharp W needle, which is manufactured by electrochemical etching, has been practically utilized as a cold field…
Cotunneling into Kondo systems, where an electron enters an $f$-electron material via a cotunneling process through the local-moment orbital, has been proposed to explain the characteristic line shapes observed in scanning-tunneling-spectroscopy (STS) experiments. Here we extend the theory of electron cotunneling to K…
We study the electrical transport mechanism of amorphous GeSbTe (GST) phase-change memory material. Amorphous GST films with 10–100 nm thicknesses were fabricated in trilayer geometry by using metal top and bottom electrodes. The temperature and voltage bias dependences of the electrical conductance were measured and…
The direct gap interband transitions in transition metal dichalcogenides monolayers are governed by chiral optical selection rules. Determined by laser helicity, optical transitions in either the $K^+$ or $K^-$ valley in momentum space are induced. Linearly polarized laser excitation prepares a coherent superposition…
Fe nanoparticles grown on SrTiO3 (STO) {001} and {110} surfaces at room temperature have been studied in ultrahigh vacuum by means of transmission electron microscopy and scanning tunnelling microscopy. It was shown that some Fe nanoparticles grow epitaxially. They exhibit a modified Wulff shape: nanoparticles on STO…
Recently, we presented structure-reactivity correlations for the gas-phase rate constants for hydrogen abstraction from sp(3)-hybridized carbon by three electrophilic radicals (X(•) + HCR3 → XH + (•)CR3; X = Cl(•), HO(•), and Br(•)); the reaction enthalpy effect was represented by the independent variable ΔrH and the…
Genetically engineered bacterial strains called whole-cell bioreporters (WCBs) generated by fusing the promoter region of stress-responsive genes and reporter genes have been widely used as biosensors to detect toxic materials in the environment. In this study, we report a dual-sensing WCB harboring recAp :: egfp and…
We report a methodology to optimize vertically grown carbon nanotube (CNT) ultracapacitor (CNU) geometrical features such as CNT length, electrode-to-electrode separation, and CNT packing density. The electric field and electrolyte ionic motion within the CNU are critical in determining the device performance. Using a…
Abstract We perform first-principles density functional calculations to investigate the effects of Al incorporation on the p -type Schottky barrier height ( ϕ p ) and the effective work function for various high- k /metal gate stacks, such as TiN/HfO 2 with interface Al impurities, Ti 1− x Al x N/HfO 2 , and TiAl/TiN/…
Commercially pure aluminium was selected as a model fcc material for a detailed investigation of the microstructural and textural evolution during processing by high pressure torsion (HPT). Vickers hardness measurements reveal that: the hardness is the lowest where the lowest strain is imposed and increases with incre…
Plasmons in the visible/UV energy regime have attracted great attention, especially in nano-materials, with regards to applications in opto-electronics and light harvesting; tailored enhancement of such plasmons is of particular interest for prospects in nano-plasmonics. This work demonstrates that it is possible, by…
Background: Spectroscopic studies in the past have exposed that PbO-B2O3 glasses are mostly classified as non-crystalline materials. These glasses prove to good host for incorporating RE (rare earth) and transition metal oxides due to its low phonon energy, large ion Polarizability and higher covalency. TM’s are widel…